Measurement of W and Z production in the forward region with LHCb

The measurement of the production cross-sections of $W$ and $Z$ boson constitutes an important test of the Standard Model at the LHC energies. The forward acceptance of the LHCb experiment allows previously unexplored regions of the $(x;Q{^2})$ space to be probed and further constrain the Parton Density Functions of the proton. Electroweak bosons are reconstructed in several leptonic decay channels, and their cross-section and cross-section ratios are reported using data collected at a centre of mass energy of $\sqrt{s}= 7$TeV with an integrated luminosity of up to $\sim$1fb${^-1}$.